Fm Global Roof Ratings

Situation is i speced a roof customer emailed last night asking wind rating i spent hours trying to figure that out after hours.

Fm global roof ratings.

A roof assembly is tested to meet. To establish burning on the underside of a test deck. Fm global conducts research for use in the fm global data sheets that our engineering field staff use to support our client s efforts to protect their business. Fm wind rating specified only.

Flashing details should be in compliance with data sheet 1 49 perimeter flashing. I m finding it much simpler just to use the manufacturer wind warranty options than screwing with all this fm stuff. This may be all that is specified. Successful constructions over steel roof decks are designated by fm global as class 1.

The perimeter flashing for roofs should be fm approved and have a minimum wind uplift rating of 105 for the high roof and 75 for the low roof. In this situation the fm regional engineer specifies that the roof must have a wind rating such as 1 60 1 75 or 1 90. Fm global wind ratings explination. Fm approvals is the only organization in the world that tests complete roof assemblies when subjected to multiple perils such as fire testing above and below the deck wind uplift testing hail damage testing accelerated weathering water leakage foot traffic and corrosion resistance testing of metal parts.

In fact it is unique among other testing laboratories in the way that it performs wind uplift testing it uses full scale roof sections measuring 12 feet by 24 feet to obtain an accurate view of expected real world performance. Designed to help roofing professionals roofnav provides easy access to the most up to date fm approved roofing related information and related installation recommendations from relevant fm global property. Provide perimeter and flashing details to fm global for review. Because fm approvals requires a 2 1 safety factor roofs with field of roof uplift forces of 30 pounds per square foot are the maximum for 1 60 ratings and 37 5 pounds per square foot are the maximum for 1 75 ratings etc.

Fm global uses a furnace calorimeter that measures heat released by the test specimen with no more than 400 btu per minute released during the steepest three minutes of the temperature curve. This may be all that is specified. Technical reports supporting code change. The research is also used to enhance external standards.